20430590 has 16 divisors (see below), whose sum is σ = 37631088. Its totient is φ = 7982016.

The previous prime is 20430589. The next prime is 20430607. The reversal of 20430590 is 9503402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23327 + ... + 24186.

It is an arithmetic number, because the mean of its divisors is an integer number (2351943).

Almost surely, 2^20430590 is an apocalyptic number.

20430590 is a deficient number, since it is larger than the sum of its proper divisors (17200498).

20430590 is a wasteful number, since it uses less digits than its factorization.

20430590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47563.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20430590 is about 4520.0210176502. The cubic root of 20430590 is about 273.3759484749.

Adding to 20430590 its reverse (9503402), we get a palindrome (29933992).

The spelling of 20430590 in words is "twenty million, four hundred thirty thousand, five hundred ninety".